How to configure docker container volumes in AWS ECS

I have several volumes defined in my docker-compose.dev.yml (from my source to docker container) .

  backend:
    build:
      context: ...
      args: ...
    volumes:
      - ./backend/:/app
      - /app/node_modules

I want to deploy my container in AWS ECS (Amazon Elastic Container Service).

1. How can I map these volumes in AWS ECS ?
2. Why source volume only contains none ?